Monday, April 20, 2009

Digital Camera Memory Cards











How to Choose the Correct Memory Card for Your Digital Camera


Gone are the days when snapping a picture meant hours of tedious work both for the photographer and the subject. The advent of the digital cameras has made shooting as well as posing for pictures a pleasurable experience.

One of the major advantages of a digital camera is the fact that there is no need for you to shop around for good quality film. Memory cards have replaced the ubiquitous photographic film in the digital camera.

These removable memory cards are necessary for storing the images. These days’ digital cameras are equipped with memory cards that are standardized in sizes of either 16 MB or 32 MB.

More often than not, a professional or even an active photographer finds that this memory is simply not enough. That is why choosing the correct memory card for your digital camera is a necessary evil. An extra memory card with a greater capacity will provide additional space to store more images.

An additional advantage is that users can simply upgrade to a number of memory cards without having to purchase new hardware in the form of different cameras. By using memory card readers, users can also transfer images to their computers; erase them from the card and reuse it seamlessly.

Most digital camera manufacturers do not reveal the exact number of pictures that can be taken using in-built memory cards. Hence the user needs to be aware that these in-built cards do not have optimal storage capacities thus increasing the need to have an additional memory card to store data.

Memory cards are a pre-requisite if you are on vacation and need plenty of images to preserve the memories. Running out of memory in your digital camera is not a good idea at this stage, so stock on memory cards. Extra memory cards are a photographer’s inseparable companion. Therefore it is vital to have plenty of space for that memorable picture.

The capacity of a memory card determines how many pictures can be stored on it. Greater the capacity, more the number of pictures that can be saved on the card. The capacity of a memory card is usually measured in MB (Mega Bytes) or GB (Giga Bytes). The latter is equivalent to 1,000 mega bytes and can store enormous number pictures.

There are several types of memory cards that can be used in a digital camera. These include CompactFlash , Secure Digital, Memory Stick, SmartMedia, MultiMedia Card (MMC), and xD Picture Card. Although these memory cards are compatible with several digital cameras, SmartMedia and CompactFlash continue to be the most widely used cards. Compact Flash cards have the biggest storage capacity and are extensively used in high-resolution digital cameras because of their increased storage capacity.

These cards are of two types; type I that is 3.0 mm thick, and type II which is 5.0 mm thick. Professional photographers often go for type II memory cards as they have bigger storage capacity than the type I cards. That need not be the case for an average consumer.

These cards also have a controller chip, which allows for greater transfer rates. However only digital SLRs can use this chip comfortably because the average digital camera does not have the internal buffer required to use this chip. CompactFlash cards are the cheapest of the memory cards available for a digital camera and are quite popular among camera owners.

MicroDrives are much cheaper than CompactFlash memory cards and may interest a less active photographer. However these cards are slower than CompactFlash cards and can also undergo shock damage wiping out all saved data. These cards are delicate and any rough handling can damage them completely. Secure Digital and MultiMediaCard memory are the smallest available memory cards, but are not ideal for digital cameras and are very rarely used here. Recently companies like Fuji and Olympus have shifted the emphasis on xD cards, thus taking away the importance of SmartMedia cards in cameras.

The xD Picture Card can be used in small cameras as well as in CompactFlash compatible cameras. Memory Stick cards were developed by Sony for use in the Cybershot series of digital cameras. Memory Stick is compatible exclusively with Sony digital cameras and is of no use in other brands. It is of vital importance that you choose non-exclusive Memory card formats for your digital cameras. This is because some companies have designed cards that work only on their branded cameras. One of the things to be kept in mind while choosing any memory card for your digital camera is the time required to transfer the images or files to your PC. Often times the bigger cards require a lot of time to transfer the data to a PC and consumers are left twiddling their thumbs.

An additional criterion in choosing the right memory card for your digital camera is speed. High speed memory cards can record data more quickly and also allow rapid data transfer thus saving time. However you need to be aware of the fact that a large memory card does not necessarily mean a fast one. One large memory card could simply be more costly than a number of smaller ones, which could suit your requirements. Older digital cameras are also not designed to hold large cards. So opting for large memory cards may not be the wisest move.

First of all, determine what format and size is supported by your digital camera. If the support is only for 16x, it makes no sense to buy a 32x card. Another point to note is that an external card reader can easily help you transfer files to your computer.

Memory card readers allow users to connect to their PC without the need to connect their digital camera as well. If you have a laptop, then the operation becomes much easier as you can simply slide the memory card reader into a designated PC slot.

source:memorybits.co.uk

Friday, April 17, 2009

Digital Camera Lens














What lenses for my digital SLR (Canon)


Many people eager for a high end digital camera buy a digital SLR body and then ask the question of what lens to put on it. If, after reading that, you think a DSLR + lenses is the right choice, you can come back here.)

(There are also full-frame cameras like the 5D, for those, the lens choice question is effectively identical to that for film bodies.)

When you take a picture, the lens does most of the work. I've bought camera gear from Amazon and been satisfied. So you could, if you are wealthy and don't mind a big heavy camera, get an digital SLR with just one lens and get some benefit from it.

If you buy just one lens to "start" you're wasting a lot of the value of your camera while that value depreciates.

Why is changing lenses so useful?

Lens design is hard. The more range you try to put in a zoom lens, the more compromises you must make. Shorter range zooms have fewer compromises than long-range ones. Trust me, if we could get a decent lens like this we would buy it. So you want short-range zooms and most of all you want prime lenses. If you can change lenses, you can put the right lens on the camera for the job, with less compromise. The 70-200mm range zooms costing $700 to $1200 are very well made. If you don't want to change lenses, P&S cameras have many major advantages. The good ones (Canon G series for example) have fast lenses. Why do I want fast lenses?

Fast lenses are lenses of large aperture (width), or low f-stop. Fast lenses are big and heavy, but you need them. Fast lenses let you do shallow depth of field. Small digital P&S can't do this very well, even though their lenses are sometimes quite fast, because shorter lenses don't have as narrow a depth of field.

Fast lenses can be stopped down to be like slow lenses, and get more depth of field when you want it. However, usually a stopped down big fast lens is better than a wide-open smaller, slower lens. Most lens problems occur at the edges of a lens, and if you stop down, you cover the edges.

Fast lenses can shoot in less light. Canon "L" series lenses are generally agreed to be the best out there. Some 3rd party lenses are also quite good for half the money. So be ready to exchange a lens if you get one of the duds. Comparing lenses

Two great sites will help you compare your lenses. The first is PhotoZone's lens performance survey. Large numbers of people have given their opinion on quality of various lenses. This site has done actual lab tests on the performance of various lenses. Canon 50mm prime lens

Every Canon owner should buy the Canon 50mm prime lens or one of its fancier cousins. It is one of the sharpest lenses out there. It's called a "normal" lens in the 35mm market, which is good because normal lenses are the easiest to make, and that's why this lens is such a bargain. Even if you want only one starter long-range zoom lens, get this one also. Even though your zoom lens has 50mm in its range, still get this lens. Tele-zoom

You can also get a very good 24mm lens from Canon or Sigma. The Canon 24mm is considered superb. If you have big money to spend, look at shorter lenses, like one of the 14mm lenses. Be prepared to test your lens and return it if it's not good. For the "x0D" and Rebel XT/XTi, consider seriously the Canon 10-22mm EF-S lens. This lens only works on the newer digital SLRs. I have this lens, and it gets me shots I could not get other ways, but it is pricey for a non-L lens, and is not as sharp as that range of lenses.

Wednesday, April 15, 2009

Digital Camera Cards

Top 5 Digital Camera Memory Cards

Your digital camera memory card is easily the most crucial camera accessory. Without it, you can store very few pictures or none at all. If you have a high-megapixel camera, you also need a high-capacity, high-speed memory card. Otherwise, you will run out of picture space quickly and wait too long for pictures to save between shots. Here is a list of the top digital camera memory cards.

1. Lexar 4 GB Professional Series 133X CompactFlash Card with Write Acceleration
Both the storage and the speed impress with this card, which features a 133x write speed. With 4GB of storage, it's also sure to hold plenty of pictures, even for digital SLR users.

2. U.S. Modular Secure Digital 4GB Extra High Speed 120X Secure Digital Card
For such a little thing, it's amazing what this card does. For digital camera owners with cameras that use Secure Digital, the cards have come a long way on storage capacity. This 4GB card stashes lots of pictures, while writing at a swift 120x speed.

3. Sony 2GB Memory Stick High Speed PRO Media
With 2GB of storage, this memory card by Sony can write up to 80 megabits per second. For Memory Stick users, this is a great choice.

4. Hitachi 6 GB Microdrive High-Capacity Ultra-Miniature Hard Drive
Wow! With 6GB of storage, this is the big mama of all memory cards on the market today. It can store pictures at a rate of 9.4 megabits per second, and it is compatible with CompactFlash drives on digital cameras.

5. FujiFilm 1 GB xD Memory Card
This is one of the smallest memory cards, yet you can still store a heavy picture load with this high-capacity, high-speed xD memory card.

Tuesday, April 14, 2009

Canon Rebel XT

Overview
Simple, Limitless Performance
For convenience, ease of use and no-compromise SLR performance, look no further than the EOS Digital Rebel XT. Featuring Canon's Digital Trinity - an 8.0 Megapixel CMOS sensor, Canon's own DIGIC II Image Processor and compatibility with over 50 EF Lenses - the new Digital Rebel XT has an all new lightweight and compact body, improved performance across the board and the easiest operation in its class, simplifying complex tasks and ensuring the perfect shot every time. With intuitive simplicity, powerful performance and unprecedented affordability, the Rebel XT is the EOS digital camera for everyone.

Features
High-performance digital SLR with 8.0 Megapixel CMOS Sensor and DIGIC II Image Processor
8.0 Megapixel CMOS Sensor
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The EOS Digital Rebel XT features Canon's 8.0 Megapixel CMOS (Complementary Metal Oxide Semiconductor) sensor, which captures images of exceptional clarity and tonal range and offers the most pixels in its class. This APS-C size sensor (22.2 x 14.8mm) has the same 3:2 ratio as film cameras, creating an effective angle of view that is 1.6x the normal EF Lens focal length. Featuring an on-chip Noise Reduction Circuit with an expanded ISO range, the Digital Rebel XT's sensor offers professional sophistication in a consumer package.

Digic II Image Processor
The EOS Digital Rebel XT's sensor is driven by the DIGIC II Image Processor, which has been enhanced across the board with improvements in speed and image quality. Information captured by the sensor is processed and assembled into images of exceptional clarity and resolution. Consuming very little energy, DIGIC II works with the sensor to ensure natural colors, accurate white balance and speedy write times, letting you focus on taking pictures.


Specifications
Type
Digital AF/AE SLR
Recording Media
CF card Type I and II
Image Sensor Size
0.87 x 0.58 in./22.2 x 14.8mm
Compatible Lenses
Canon EF Lenses including EF-S Lenses (Focal length conversion factor: Equivalent to approx. 1.6x indicated focal length compared to 35mm format)
Lens Mount
Canon EF mount
Image Sensor
Type
High-sensitivity, high-resolution, single-plate color CMOS sensor
Pixels
Approx. 8.0 Megapixels
Total Pixels
Approx. 8.2 Megapixels
Aspect Ratio
2:3 (Vertical:Horizontal)
Color Filter System
RGB primary color filter
Low-pass Filter
Fixed position in front of the image sensor
Recording System
Recording Format
Design rule for Camera File System 2.0
Image Type
JPEG, RAW (12bit)
Simultaneous Recording: Possible
File Size
JPEG: (1) Large/Fine: Approx. 3.3 MB (3456 x 2304), (2) Large/Normal: Approx. 1.7 MB (3456 x 2304), (3) Medium/Fine: Approx. 2.0 MB (2496 x 1664), (4) Medium/Normal Approx. 1.0 MB (2496 x 1664), (5) Small/Fine: Approx. 1.2 MB (1728 x 1152), (6) Small/Normal: Approx. 0.6 MB (1728 x 1152); RAW: Approx. 8.3 MB (3456 x 2304)
Folder Setting
Automatic setting
File Numbering
(1) Continuous numbering, (2) Auto reset

Standard parameters plus up to three custom processing parameter sets and monochrome can be set
Interface
USB 2.0 Hi-Speed
Image Processing
Type
Auto, Preset (Daylight, Shade, Cloudy/Twilight/Sunset, Tungsten light, White fluorescent light, Flash), Manual (Custom: read off photo quality gray card or white subject)
Viewfinder
Type
Eye-level SLR (with fixed pentamirror)
Coverage
Approx. 95% vertically and horizontally (against JPEG Large)
Magnification
0.8x (-1 diopter with 50mm lens at infinity)
Eyepoint
21mm
Built-in Dioptric Adjustment
-3.0 - +1.0 diopters
Focusing Screen
Fixed
Mirror
Quick-return half mirror (Transmittance: reflection ratio of 40:60, no mirror cut-off with lenses up to EF 600mm f/4)
Viewfinder Information
AF points, AE lock, FE lock, AEB in progress, Flash ready, Improper FE lock warning, High-speed Sync, Flash exposure compensation, Red-Eye reduction, Shutter speed, Bulb, FE lock, Processing data, Built-in flash recycling, Aperture, Exposure level display (Exposure compensation, Manual exposure level, AEB level, Flash exposure compensation, Red-Eye Reduction lamp on time display), Max burst during continuous shooting, AF/MF focus confirmation, CF card full, CF card error, no CF card
Depth-of-Field Preview
Enabled with depth-of-field preview button
Eyepiece Shutter
None (provided on strap)
Autofocus
Type
TTL-CT-SIR with AF-dedicated CMOS sensor
AF Points
7
Metering Range
EV 0.5 - 18 (at ISO 100)
Focusing Modes
One-Shot AF, Predictive AI Servo AF, AI Focus AF (Automatically selects One-Shot AF or AI Servo AF selected according to shooting mode), Manual Focusing (MF)
AF Point Selection
Automatic selection, manual selection
Selected AF Point Display
Superimposed in viewfinder and indicated on LCD panel
AF-assist Beam
Intermittent firing of built-in flash, effective range: approx. 13.1 ft./4m at center, approx. 11.5 ft./3.5m at periphery
Exposure Control
Metering Modes
Max. aperture TTL metering with 35-zone SPC. (1) Evaluative metering, (2) Partial metering at center (approx. 9% of viewfinder), (3) Center-weighted average metering
Metering Range
EV 1-20 (at 68° F/20° C with 50mm f/1.4 lens at ISO 100)
Exposure Control
Program AE (shiftable), Shutter-priority AE, Aperture-priority AE, Automatic Depth-of Field AE, Full Auto, Programmed Image Control modes (Portrait, Landscape, Close-up, Sports, Night Portrait, Flash Off), E-TTL II Autoflash Program AE, and Manual
ISO Speed (Recommended Exposure Index)
Equivalent to ISO 100-1600
Exposure Compensation
Up to +/-2 stops in 1/2- or 1/3-stop increments (1) Manual exposure compensation (2) AEB (Auto Exposure Bracketing)
AE Lock
Auto: Operates in One-Shot AF mode evaluative metering when focus is achieved; Manual: Enabled with AE lock button (No AE lock in Basic Zone modes)
Shutter
Type
Vertical-travel, mechanical, focal-plane shutter with all speeds electronically-controlled
Shutter Speeds
1/4000 to 30 sec. in 1/2- or 1/3-stop increments, bulb, X-Sync at 1/200 sec.
Shutter Release
Soft-touch electromagnetic release

Set with C. Fn-02
Self-timer
10-sec. delay
Remote Control
Remote control with RS-60E3 Terminal or Wireless remote controllers RC-1/RC-5
Built-in Flash
Type
Auto pop-up, retractable, built-in flash in the pentaprism
Guide Number
13 (at ISO 100 in meters)
Recycling Time
Approx. 3 sec.
Flash-ready Indicator
Flash-ready indicator lights on in viewfinder
Flash Coverage
Up to 17mm focal length (equivalent to 27mm in 35mm format)
External Speedlite
EOS Dedicated Speedlite
E-TTL II autoflash
Drive System
Drive Modes
(1) Single, (2) Continuous, (3) Self-timer/Remote Control
Continuous Shooting Speed
Approx. 3.0 fps (with Battery Pack NB-2LH, at Tv=1/250 sec. for all recording qualities)
Maximum Burst
14 shots (Large/Fine)
LCD Monitor
Type
TFT color LCD monitor
Monitor Size
1.8 inches
Dots
Approx. 115,000 pixels (Displayed pixels)
Coverage
Approx. 100% (for JPEG images)
Brightness Adjustment
5 levels (settable with menu's "LCD brightness")
Image Playback
Display Format
(1) Single image, (2) 9-image Index, (3) Magnified Zoom, (4) Auto Play, (5) Auto Play right after shooting
Highlight Warning
In the single image with information display mode, the highlighted portions containing no image information with blink
Image Protection and Erase
Protect
A single image can be protected or unprotected
Erase
A single image or all images stored in a CompactFlash card can be erased if they are unprotected
Menus
Menu Categories
(1) Shooting 1 [6 items], (2) Shooting 2 [7 items], (3) Playback [5 items], (4) Setup 1 [7 items], (5) Setup 2 [7 items]
LCD Monitor Language
Any of the following 15 languages can be selected: English, German, French, Dutch, Danish, Italian, Finnish, Norwegian, Swedish, Spanish, Simplified/Traditional Chinese, Korean, Russian, and Japanese
Firmware Update
Enabled by the user
Power Source
Battery
Battery Pack NB-2LH (x1)
Dimensions and Weight
Dimensions (WxHxD)
4.98 x 3.71 x 2.63 in./126.5 x 94.2 x 64mm
Weight
17.1 oz./485g
Operating Environment
Working Temperature Range
32-104° F/0-40° C
Working Humidity Range
85% or less